Threading-die.



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-UN ITED STATES PATENT. OFFICE.

oscsaa. sm'rn, or omvntsnn, x10, assumes. we was NATIONAL-ACMEmanurac'ronmo comm, or onsvnnsnn, care, A oonrom'rron or 01110.

rmanmmnm specification of Letters Patent.

Patented Sept. 17,1012.

To all whom. it may concern:

Be it known that I Osoaa A. Stirru citizen of the Unite States, residingat Cleveland, inthe county of Cuyahoga and State of Ohio,'have inventedcertain new and useful Improvements .in Threading- Dies, of which thefollowing is a specification.

This invention relates to threading dies of the character known asopening or selfopcning dies, the object of the invention being toprovide an improved tool of this character simple in construction andeasily operated, and in the use of which there will be no variation inthe thread during the operation of the die by reason of the fact thatthe construction is such that it is impossible for the die chasers toopen while a thread is being cut even thou h the die chaser operatingmeans should 0 slightly shifted and in which also the die wil out thefull len th of the stock.

In thrca in tools as usually constructed the die chaser locks, or themeans for closing them, are provided with tapered surfaces extending.depthwise of the tool, in consequence of which any slight movement ofthe die chaser operating means ermits the opening of the die chasers anconsequeut y a variation in the thread cut, thus materially interferinwith the proper action of the tool, am one of the objects of the presentimprovement is to avoid this defect in threading dies of this elassandalso to avoid the necessity of moving the, dies in the direction of theaxis of the die in Orvder to open such dies.

In the drawings accompanyin and forming part of this specitication, Iigure -1.is. a front end view, partly brokenawn ..-and paltl mseetiou,-o-this improved read! mg to; Fig. 2 .is a cross-sectional viewthereof taken-on the line 2-2-2, F ig. 1; Fig :i is a similar crosssectional view of a art; of the threading tool shown in Fig. 2 i lus-'trating the open position of hue ot;tl\e die rhascrs; Fig. an a detail-;view' illustratingthe means for adjusting';'the die-.chasers; Fig. isa;perspective, view1ef the die body; Fig. tl-is aersp ti,ve viewppartly.insecs, tion, of theff' ie headi Fig. ,-7;;1sip perspeptivm view of the.die .bleck operating-means or. com Fi 81 is a, perspective 4 memo!.Lthtn end cap oa-the too rigtn isgadetailzviewt of the micrometeradjusting means for the die chaser blocks; and Fig. is a detail viewillustrating one of the die chasers, its block and one of thespring-actuated devices for opening the die chasers.

Similar characters of reference indicate corresponding parts throughoutthe figures of the drawin The threading tool, in the preferredembodiment herein shown and described, comprises a die body 2 havin anaxial bore and a plurality, as four, ui es or ways 3. 4, 5 and 6extending radially of the die body. The rear portions of these ways areundercut, as shown at 7, Fig. 5, to form recesses or grooves. In theseways slide die carriers or locks 8, see Fig. 10, having lateralextensions 9 and 10 which slide in the recesses or grooves 7, by whichconstruction the blocks are guided in their opening and closingmovements and are maintained against. depthwise movement. Each of theseb ocksis provided with projectin pins 11. in position to engage a. headepin or piunger 12 pressed outward by a coil spring 18, each pin and sring being located in an o ening 4 in the ie body, one at each side 0?the is block. These springs are effective to shift the die blocksoutwardly from the axis of the body.

In each of the die blocks is secured a die or die chaser 15; it beingsecured therein by a screw 16. The die blocks are shown as of U-shapedform for the reception of such die chasers. The outer end of each dieblock is tapered circumferentially throughout the major portion thereof,as M117, and at the rear outer end thereof is also tapered de thwise ofthe tool as at 18. -Fo r.elo'sing tie die chasers suitable means .isprovided, herein designated as the die .ehaser or die. chaser blockoperatin means or member and consists of an axially ored disk 10 havingforwardly extending projections or arms preferably tapered on theirunder forward edges, as at 21, whereby they will eotiperatemore easilywith the depthwise tapered surfaces -;18 of the chaser blocks..Encirclingthis 'disk and its forwardly ex- -te nding.arms20 is the diehead 22 having the usual collaror groove 28 by means of -which'theheadis shifted do thwise or back andforth-relativelg to the ie body. This..collar -28 isguide by the rearwardly. ex-

- maintains tending shank forming patio: the core or body and whichprojects beyond such collar topermit to and fro movement of the collarto 0 en and close th'e'dies, suelishank forming he means for'attachingthe dies to the l0ltlin% means or chuck so that the die body and lochascrs are held stationary. against independent movement in the direotion of the axis of the die. For iimitin the rearward movement of thedie head suitable devices are provided shown as "a pair of screws 24 proecting t rough open mgs in the die body and assing' through elongatedslots 25 in the isk 19 and into threaded openings in'the rear or backwall of the die head. These screws are pro vided with enlargementsorheads' 26 adapted to en age-the outer end of a sleeve 27 located in tis countersunk bores or open-' ings of the die bod through which thescrews pass, the hen s 26 of which screws thus limit the rearwardmovement of the die head. The sleeves 27 have the heads 28 thereof inengagement with the forward side of the chaser o eratin means or disk10, whereb this dis and t e die head are in operative enga ement forsimultaneous movement forwar and back-' ward.

For adjusting the chasers toward and from the work a suitable micrometerscrew is provided extending diagonall through t 1e head, and this screwis provide with a portion of less diameter, as 80, for the reception ofthe bifurcated end of a stud, as 81, see Fig. 7, which stud iscarried'by the disk 19, so that on the adjustment of this screw it willoscillate or rotate the disk 19 relatively to and independently of thehead in one direction or the other according to the direction in whichthe adjusting screw is turned, and so adjust the chasers relatively tothe work 'by reason of the-fact that, the forwardly projecting arms ofthe disk 10 are, as'hereinbefore 'stated,in engage-' ment with the"circumterentially tapered portions of the chaser blocks,-this' taper bemg transverse to theaxis' of 'the' 'tooh-"the major ortion of the outerend of thecha'ser block owever, beinga' straight surface in thedirection of the axis 0 'thVtool, or dept-hwise of the block. In otherwords it is not tapered in the directionlofthe axis of the tool exceptat its rear side isothat when the chascrs are closed'by'the' torwardmovement of the head and the ehaser'block closing means the arms ofthe'riatterare in engagement with the outer depthwise strai ht surfacesof a the chaser blog'ksya'ndthere ore no slight'shifting of the h sdandthe'ehas'er forward-or backward dlrection will permitgaiiye n oye meatof the chaser 'bloekstan'd' 'the ,ehasers carried-thereby, while-iifosdillatingthedisk- 19 by. means of the {tin crome terwerew the1,osa,evo

chaser blocks will beadjusled in the mannor stated. Or, to mt it inother language the outer ends of tlie chaser blocks are ta 'eredtransversely to the'axis oi the tool y reason of which taper the chaserblocks and thereby the chnsers may be lttlllln'lt'tl on swinging 0roscillating the arms oil the (link 19 bymeans of the micrometer screw,but as the outer ends of these blocks are straight depthwise throughoutthe major portion thereof it follows that when the tool is at work noslight movement of the disk 19 or the head carrying the same forward orbackward will permit any movement of the .ohaser blocks or chaserscarried thereby, @since the arms at this time have passed be- {yond orforward of the tapered surfaces 18 and are in engagement with thedcpthwisc strnight surfaces of the blocks, whereas heretofore it hasbeen the usual iractice to :have the outer ends of the bloc (s taperedin the direction of the axis of the tool, or depthwise so that anyslight movement oi :the head backward or forward would al feet theposition of the chasers and result in .a variation in the thread beingeat. It will thus be seen that the outer ends of the die chaser blocksare ta )ercd in two directions one transversely re ativcly to the axisof the tool and the other dep'thwise of the tool, but that the lattertapered surface is at the rear side of the block, so that when thechasers have been completely closed the arms of' the operating means ordisk 10 have gassed awayifrom or are forward of the g epthwisetaperedsurfaces of the blocks and conseqaentl there is no opportunity for Ithechasers to s lift fromtheir proper posi- Etions should the head he movedbackward 101 forward other than in the proper manner .and by the meansrovided for that pur- Ipose. The elongate slots 25 in the disk It),'throu h which the screws 24 and sleeve 27 'exten permit this swingin oroscillating :movement ot the chaser bock operating means-or disk 10inthe manner heremlwforc described: From the foregoing it will he-observed that the operating means for the chaser blocksthus has a-baclward and forwa'rd'movementfor opening or closing the chaser blocks, sothat the die chasera are istationary at all times that is have nomovement whatsoever in the direction of the axis lot the die, and'also-amovement in a direction transverse thereto, or as hereinhotore describedan oscillatin or swingingmoregment for positioning t \e chaser blocksand thereby the chnsers relatively to the work to-be' operated u on, thelatter movement he- ,in 'eflected byitie-micrometerscrew herein 'be orereferreditogior by any other suitable means whielr ivmayibe desired-touse, while "the'tcrmer is atieeted hythe shifting ot the ';head backwardand forward by the means usually-'provided-' for this purpose. 'lhua,

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each diejaw or chaser block is provided with a pair-of cam or taperedsurfaces located at right angles to eachother, one of which coo crateswith the chaser closing means to 0 ose'and o n the-chasers while theother cooperates t iere'with to adjust-the positions of the chasersrelatively t0' th0 work, asthe result of which if the dieor the headshould move the least bitin cutting the chasers, however willalwayskee'p the same position-at-which they were set-until the dieis-opened,sothatuntil thechaser block operating means or cam diskis'completely ulledolf from the'ends ofthe die chaser locks there can beno openingor closinrg of'the chasers on the work and consequent y thethread will not be made thicker at the end as heretofore.

In operation, when the head is moved forwart the cam operating disk 19closes the die in a manner which will be readily understood from thefore oing and when the head is moved rearwar y or backwardly 3 the arms20 are withdrawn from the outer ends of the die blocks, whereupon" thesprings 18 ress the die blocksoutward so as to shift t is chasersoutwardly'and'thercby open the die. The sprin actuated studs not onlyact to open the die looks, but also hold the same in enga ement with thearms of the disk when the utter are shifted forward to engage the outerends of the blocks.

The front end of the die is covered with a cap 32, see Fig. 8, securedthereto by suitable screws and which cap is provided with a pair 0openings 88 locuted in register with: the limiting screws 21, wherebythe-movement of these screws-relatively to the 'die body as the headslides forward and backward is not interfered with. p

I claimaa my invention: a

1. The combination of a 'die body and shank said body having an axialbore and rovided with ways, members Provided with thread cutting-meansmovabe radially in said ways, means shiftable relativel to'said body andshank to'shift the three -cuttin members, means for shifting said meansan beyond which the shank projectsfor attachment to its holdin means,"and 'ineans for holding said;shifta le means andhitsrshift ing means inoperative relation thereby to reventrcmatureindependent movement; ofsaid sluftable means in any direction rela tively to said-thread-cuttinmembers. said' thread-cuttingmembers an shiftable means havingonena camsurface extendirig'in onedirection and one a camsurface: extending: inanother direction whereby on .the operas tion zofa said ,f means win one2 direction ass-i thread "cutting members will i be-cloeedand onthe'lcpereftioniofsonei'ofsaid' tiieniberszing another-1direction-the.gthreadcattingsrnem bers will besdjusted=relatively;toithelworki -:2;1-'1he': combination: 01 fax-diesbtaiy fand shank said body having an axial bore and provided withways,-members having thread cutting means movable radially In said ways,each of said thread cutting members having a air of cam surfacesextending ill op site irections, shiftable means having a Orvvard andbackward movement rela- .tivel to said body and shank and beyond whicthe shank'projects for attachment to its holdinimeans for closing thethread cuttin me ers byzengagement'with one of sai cam'surfaces an alsohaving a swing- I ing movement to adjust the thread cutting membersonthe swinging ofsaid means relatively to-the other of said cam surfacesmeans for shifting said shiftable means, and means for holding saidshiftablc means and its shifting means in o crative relation 'thereby torevent prema are independent movement 0? said shiftable means in anydirection relatively to said thread-cutting tmembers.

8. The combination of a die body and shank-said body having an axialbore and provided with ways members having thread louttin means mova leradially in said ways, Eeach 0 said thread cutting members having ispair of cam surfaces extending in op 0- site directions shiftable meanshavin a orward and backward movement relatively to said body and shankand beyond which the shank projects for attachment to its holding meansfor closing the thread cuttin members by on agement with one of said camsurfaces an also having a swinging movement to adjust'the' threadcutting members on the'swingln of said means relatively to the other ofsai cam surfaces means for swinging said operating means and comprisinga micrometer screw, means for shifting said ,shiftable means, and meansfor holding said ishiftable means and its shifting means in operativerelation thereby to prevent pro- :maturo independent movement of saidshiftable means inany direction relatively to Zsaidthread-cutt-ingmembers.

4.1 The combination of a die body and shank said'body having an axialbore and iprovided with ways, members having thread lqutting me'ansmovable :radially in said way'speach of said thread cut-ting membershavin rat .its rear outer end' a cam surface exten ing defthwise thereofand havin in frontpthereo a strai ht surface extends :depthwise thereofan a cam surface (\Xiflllt ing vtransverscly pfsuch straight surface, shftable means having a forward-and backward' movement relatively to saidbody and shaxzlkiand abeyondqwhich. the shank project a a'folfaattachmenttoiits holdin means and a isw nging movernent and "e'ective to close 'f'the's thread-cutting means ou engagementflbiid'ftb'iiold them' a ainst movement on enf'gagement-withsuc straightsurface and in as they. 'tran'sverselyirex eilectiveltoradjust thethread cutting members on-,theswingin thereof relativel to thetransversely ex nding cam. sur ace, meansfor 'swin in the same, meansfor shiftin said shi tab e means backward and fcrwa .and means forholding said shiftable means and its shifting means in operativerelation thereby to prevent premature independent movement of. saidshiftable thread-cutting members. 1

-15. The. combination of a die body and shanksaid-body having an axialbore and provided with ways,me:nbers having thread cutting means movableradially in said ways, each of said thread cutting members havin at itsrear outer end a cam surface exten ing de thwise thereof and havin infront thereo a strai htsurface exten dg depthwise thereof an a camsurface exten ing transversely of such straight. surface, shiftablemeans having a forward and backward movement relatively, to said bodyand shank and beyond which the shank projects for attachment to itsholdin means and a swinging movement, and e active to close the threadcutting means on engagement with the desthwise extending cam surface andto hol such thread cutting means against movement on engagement withstraight surface and effective to'adjust the thread cutting members onthe swinging thereof relatively to the transversely extending camsurface, means for swinging the same, said shiftable meanscomprising'adisk having forwardly projecting arms, means com rising a headinclosingsaid disk and arms, or shifting said disk, and-means for holding saiddisk and its head in 'operai tive relation thereby to reventrematureindependent movement saiddisk in any direction relatively to saidthread-cutting members. a

(l. The combination of a die body and shank said body having anaxialbore and provided with ways, members havi thread cutting" meansmovable radially in said ways, each of said threaded cutting membershavin at itsrear outer. end-a'camsurface tblilobackwurd movementrelatively-to said body and shank and beyond which theshank'projectsfornattachment toiyits holding means i and a swinging-movement; andeffective: to

close theTthre'ad' cutting meanston engage- 00;.ment with the dcpthwiseextendingcamisur face and toihold'lthema ainst movement on meme . n ameat with"'.such a mi htsurfaee audv ve'toradiust the thre'a cutting 00"themwmg nding '1 our means in any direction relatively to said exten ingdefithwise thereof and :havin in means for swingin the same, means forshifti said shiftab e means backward and forwar means for holding saidshiftable means and its shifting means in operative relation thereby toprevent premature indoendent movement of said shiftablc means m: anydirection relatively to said threadcutting members and for limiting thebackward movement thereof.

7. ,The combination of a die body and shank said body having an axialbore and srovided with ways, die blocks movable raially in said ways,each of said blocks having at its rear outer end a cam surface extendingdcpthwise of the block and having in front thereof a strai ht surfaceextending dcpthwise of the blocii and a cam surface .extendingtransversely of such straight surface, means, comprising a disk havinforward] rejecting arms and a head inc osing said is and arms, and havina forward and backward movement relatively to said bod and shank andbeyond which the shank i pro sets for attachment to its holding means,

sai disk also having a swin ing movement and effective to close the iceon engngement with the dcpthwise extending cum surfaces and to hold themagainst movement on :ergsgement with such straight surfaces and such sective to adjust the dies on the swingin r thereof relatively to thetransversely extend -i "camsurfaces a micrometer screw for Iswmging saiddisk means for moving said operating 'means backward and forward, andmeans for limiting the backward moveiment of said operatin means andcomprisin means effective to iold the same in operlativerrelation withthe die head.

, 8. The combination of a die body and shank said body having an axialbore and =grovided with ways, die blocks movable raialiy in said ways,each of said blocks havat its rear outer end a cam surface extendingdcpthwise of the block and having in front thereof a strai ht surfaceextending .de thwise of the blocii and a cam surface is: endingtransversely of such straight sur- !face, means, comprising a disk havinforwardiy irojecting arms and a head inc osin r said is and arms, andhaving a forwar andbackward movement relatively to said ibody-and shankand beyond which the shank jprqects for attachment to its holding means,said disk also having a swinging movement and effective to close thedies on engagement with the dcpthwise extending cam surfaces .and tohold them against movement on enga ement with such straightsurfacesandeffective-to adjust thevdics on ,the-swingingthereofrelatively to the transiversely'extendi cam surfaces, a micromieterscrew for swinging said disk, means for moving said operatin meansbackward-and Lthereof relativelyii;

,; movementwf'said operating means and com prising means effective tohold the same in Si ed at Cleveland, Ohio, this 28th day operatlverelation with the diehead, and of arch, 1911. means for OPBIliIlg eachof said die blocks A and comprisxng a projection carried'by the 5 blocksand a spring operated device carried Witnessesz.

by the body in engagement with said projec- P. F. Mnnnmomz, hon. A. B.BREEZE.

Copiu of this patent may be obtained for A" can}: each, by droning thecommissioner of Patents, wuhln'flon, D. 0.

